We Broke Down Every Cummins Camshaft
About this episode
The episode delves into advanced diesel camshaft theory, exploring volumetric efficiency and the intricacies of Cummins camshafts.
Todd, Will, and Myer are back for round two on camshafts, picking up right where they left off and going even deeper into diesel cam theory. If you got something out of the last episode, this one takes it further with real numbers, real data, and some genuinely nerdy breakdowns that most Dodge Cummins guys never get access to. This episode is built around volumetric efficiency and how race engines actually push past 100 percent. The crew explains scavenging, low pressure zones, and how intake air speed changes everything about when you should close that intake valve. They break down piston speed and rod angle, why 70 degrees after top dead center is the sweet spot for airflow, and why valve lift speed is limited by lifter size, which is a big reason Cummins runs such a massive lifter compared to the gas world. From there Will pulls out actual cam data measured off real factory camshafts using a cam doctor tool, comparing intake and exhaust duration and valve timing across every generation of Cummins, first gen, 12 valve, VP44, and common rail. The differences in exhaust valve opening timing alone explain a lot about why certain Cummins generations start easier, burn cleaner, or…
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